Quote:
Originally Posted by RuggedPineapple
Thats exactly my point. USB audio has several modes. Audio Accessory Mode spits out an actual analog audio signal over the USB port. This is often what cheaper accessories use because the audio hardware in the device continues to do the heavy lifting of conversion. USB ADC Mode sends a digital audio signal out over the port and offloads a lot to the USB device.
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Some Micro and Mini USB devices had that too. It's not a real USB mode, it's simply switching pins from USB to Analogue.
Some Canon DSLRs do this with the Mini-USB switching it to Analogue composite Video and Analogue audio.
Real USB audio uses D- and D+ data and on a "gadget" needs an OTG mode.
They simply made a non-USB mode of the connector part of a spec. I have a mini-USB port Smart Watch that does it too for regular 32 Ohm earphones. It saves a 30c 3.5mm jack socket.
All my USB audio adaptors are real USB using +5V, D- D+ and 0V. They are all USB-A connector, so need a USB OTG adaptor (which is a dumb connector). I do have some peripherals with the OTG wiring built in that can plug direct into mini-USB or micro-USB.
If USB Audio was going to work at all on any device later than a PW3, I'd assume it would only be real USB Audio, like the PW3 has.
Audio Accessory mode is NOT a real USB Audio mode. It's simply switching the connection wires to what would have fed a jack socket.